纳米银对椰油酰基谷氨酸三乙醇胺盐表面活性的影响

doi:10.3969/j.issn.1001-1803.2022.04.003

摘要/Abstract

摘要：

以N-椰油酰基谷氨酸为原料,原位化学还原法绿色制备50 mg/kg纳米银和椰油酰基谷氨酸三乙醇（TEA）胺盐,获得纳米银椰油酰基谷氨酸TEA胺盐复合体系。采用电导法、表面张力法、接触角法及罗氏泡沫仪研究纳米银对复合体系的cmc、泡沫性能、pH、Krafft点以及润湿性能的影响,结果表明：纳米银可增强体系的起泡性能和稳泡性能;随着纳米银用量的增加,体系的cmc值先降后升,起泡性能呈现先增强后下降趋势,对pH、Krafft点、润湿性能的影响均不明显,本实验中5%的50 mg/kg纳米银对椰油酰基谷氨酸TEA胺盐的表面活性有优良的协同效应。采用UV-Vis、FT-IR和Zeta电位探究纳米银的作用机制,发现体系中纳米银没有离解,随着其用量的提高,纳米银倾向以静电作用的方式吸附于N-H键附近,产生配位效应,物理吸附大于化学吸附;随着纳米银用量的增加,复配体系的Zeta电位绝对值下降,但Zeta电位绝对值大于50 mV,表明纳米银椰油酰基谷氨酸TEA胺盐复配体系有着较好的稳定性。

关键词: 纳米银, 椰油酰基谷氨酸TEA胺盐, cmc值, 泡沫性能, Zeta电位

Abstract:

The mixed system of 50 mg/kg nano-silver and triethanolammonium （TEA⁺） cocoyl glutamate was prepared by green chemical method using cocoyl glutamic acid as raw material. The effects of nano-silver on the critical micelle concentration （cmc）, foaming properties, pH, Krafft point and wetting properties of the mixed system were studied by measurement of conductivity, surface tension and contact angle and by Ross foam analyzer. The results showed that nano-silver could enhance the foaming performance and foam stability of the system. With the increase of the amount of nano-silver, the cmc was first decreased and then increased, and the foaming performance was first enhanced and then decreased, while no significant effects on pH, Krafft point or wetting performance were observed. In this experiment, 5% of 50 mg/kg nano-silver had excellent synergistic effect on the surface activity of TEA-cocoyl glutamate. The mechanism of nano-silver was explored by UV-Vis, FT-IR and Zeta potential. The results showed that the nano-silver did not dissociate in the system. And with the increase of its dosage, the nano-silver tended to adsorb near the N-H bond by electrostatic interaction, resulting in a coordination effect. The physical adsorption of nano-silver in this mixed system was greater than chemical adsorption. It was also found that with the increase of the amount of nano-silver, the absolute value of Zeta potential of the mixed system was decreased, but the absolute value of Zeta potential was greater than 50 mV, indicating that the mixed system of nano-silver/cocoyl glutamic acid triethanolamine had good stability.

Key words: nano silver, TEA-cocoyl glutamate, cmc, foaming performance, Zeta potential

中图分类号:

TQ423

喻冬秀,金相新,刘嘉欣,李俊朗. 纳米银对椰油酰基谷氨酸三乙醇胺盐表面活性的影响[J]. 日用化学工业, 2022, 52(4): 363-369.

Yu Dongxiu,Jin Xiangxin,Liu Jiaxin,Li Junlang. Effects of nano-silver on the surface activity of triethanolammonium cocoyl glutamate[J]. China Surfactant Detergent & Cosmetics, 2022, 52(4): 363-369.

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	cmc/ （g/L）	γ_cmc/ （mN/m）	Г_m/ （mol/m²）	a_m/ nm²
对照组	1.60	23.20	3.17×10^-6	0.523 8
3%纳米银组	1.35	23.30	4.51×10^-6	0.368 2
5%纳米银组	1.05	24.05	5.13×10^-6	0.323 7
8%纳米银组	1.50	24.20	3.43×10^-6	0.484 1